How do I approach Coding & Algorithms interview questions?

Coding & Algorithms questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master coding & algorithms interviews.

What difficulty level is this interview question?

This is a Medium difficulty Coding & Algorithms question, commonly asked during Onsite rounds at Coinbase.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at Coinbase during technical interviews.

Implement custom Java iterators

Last updated: Mar 29, 2026

Quick Overview

This question evaluates a candidate's mastery of Java fundamentals, object-oriented design, interface implementation (Iterator), and the ability to write runnable unit tests in the Coding & Algorithms domain.

Medium
Coinbase
Coding & Algorithms
Software Engineer

Coinbase

Aug 4, 2025, 10:55 AM

Software Engineer

Onsite

Coding & Algorithms

Question

Implement, in Java and without IDE assistance, an Iterator interface and two concrete iterator classes that satisfy three given sub-problems, writing runnable code and tests entirely from scratch.

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